Apparatus for detecting X-ray

Abstract

An apparatus for detecting an X-ray includes a photo diode having an anode electrode and a cathode electrode, a switching transistor, and a first storage capacitor that has one end connected to the cathode electrode and another end connected to the switching transistor.

What is claimed is: 
     
       1. An apparatus for detecting an X-ray, the apparatus comprising:
 a photo diode including an anode electrode and a cathode electrode; 
 a switching transistor; and 
 a first storage capacitor having a first end connected to the cathode electrode and a second end connected to the switching transistor, wherein a first electrode of the switching transistor constitutes the second end of the first storage capacitor. 
 
     
     
       2. The apparatus of  claim 1 , wherein the first storage capacitor is connected to the photo diode in series. 
     
     
       3. The apparatus of  claim 2 , wherein a bias voltage is applied to the anode electrode. 
     
     
       4. The apparatus of  claim 1 , further comprising
 a data line, 
 wherein the switching transistor includes a gate electrode and a second electrode connected to the data line. 
 
     
     
       5. An apparatus for detecting an X-ray, comprising
 a photo diode including an anode electrode and a cathode electrode; 
 a switching transistor; 
 a first storage capacitor having a first end connected to the cathode electrode and a second end connected to the switching transistor; and 
 a second storage capacitor having a first end connected to the anode electrode and a second end to which a bias voltage is applied. 
 
     
     
       6. An apparatus for detecting an X-ray, the apparatus comprising:
 an X-ray receiving portion including a plurality of light sensing pixels; and 
 a data detector that detects an electrical signal transmitted from the X-ray receiving portion, wherein each of the plurality of light sensing pixels includes: 
 a photo diode including an anode electrode and a cathode electrode; 
 a switching transistor; and 
 a first storage capacitor having a first end connected to the cathode electrode and a second end connected to the switching transistor, wherein a first electrode of the switching transistor constitutes the second end of the first storage capacitor. 
 
     
     
       7. The apparatus of  claim 6 , wherein the first storage capacitor is connected to the photo diode in series. 
     
     
       8. The apparatus of  claim 6 , further comprising
 a data line, 
 wherein the switching transistor includes a gate electrode and a second electrode, the second electrode being connected to the data line. 
 
     
     
       9. The apparatus of  claim 8 , wherein the data detector includes a read-out portion connected to the data line, the read-out portion including an amplifier, a feedback capacitor, and a reset switch. 
     
     
       10. The apparatus of  claim 9 , wherein the data line is connected to a first input port of the amplifier, a reference voltage is applied to a second input port of the amplifier, one end of the feedback capacitor is connected to an output port of the amplifier, and the reset switch is connected to the feedback capacitor in parallel. 
     
     
       11. An apparatus for detecting an X-ray, the apparatus comprising:
 a photo diode including an anode electrode and a cathode electrode; 
 a switching transistor; 
 a bias line; and 
 a storage capacitor having a first end which constitutes a portion of the bias line and a second end connected to the anode electrode. 
 
     
     
       12. The apparatus of  claim 11 , wherein the storage capacitor is connected to the photo diode in series. 
     
     
       13. The apparatus of  claim 11 , further comprising
 a data line, 
 wherein the switching transistor includes a gate electrode, a first electrode, and a second electrode, the first electrode being connected to the second end of the storage capacitor and the second electrode being connected to the data line. 
 
     
     
       14. An apparatus for detecting an X-ray, the apparatus comprising:
 a thin film transistor that is on a substrate and that includes a gate electrode, a first electrode, and a second electrode; 
 a first interlayer dielectric film on the thin film transistor; 
 a cathode electrode that overlaps the first electrode with the first interlayer dielectric film interposed between the cathode electrode and the first electrode; 
 a photoconductor layer on the cathode electrode; and 
 an anode electrode on the photoconductor layer, wherein the first electrode and the cathode electrode constitute both ends of a storage capacitor. 
 
     
     
       15. The apparatus of  claim 14 , further comprising:
 a second interlayer dielectric film on the anode electrode; and 
 a bias line that is on the second interlayer dielectric film and that is electrically connected to the anode electrode through a contact hole. 
 
     
     
       16. The apparatus of  claim 14 , further comprising:
 a second interlayer dielectric film on the anode electrode; and 
 a bias line that overlaps the anode electrode with the second interlayer dielectric film interposed between the bias line and the anode electrode. 
 
     
     
       17. An apparatus for detecting an X-ray, the apparatus comprising:
 a thin film transistor that is on a substrate and that includes a gate electrode, a first electrode, and a second electrode; 
 a first interlayer dielectric film on the thin film transistor; 
 a cathode electrode that is on the first electrode and that is electrically connected to the first electrode; 
 a photoconductor layer on the cathode electrode; 
 an anode electrode on the photoconductor layer; 
 a second interlayer dielectric film on the anode electrode; and 
 a bias line that overlaps the anode electrode with the second interlayer dielectric film interposed between the bias line and the anode electrode. 
 
     
     
       18. The apparatus of  claim 17 , wherein the first electrode and the cathode electrode constitute both ends of a storage capacitor. 
     
     
       19. An apparatus for detecting an X-ray, the apparatus comprising:
 a photo diode including a first electrode and a second electrode; 
 a switching transistor; and 
 a storage capacitor having a first end connected to the first electrode of the photo diode and a second end connected to the switching transistor, wherein a first electrode of the switching transistor constitutes the second end of the storage capacitor.